‘distinct’ can't work as the description in tutorials

[liuyunwei]

the test code in http://reactivex.io/rxjs/manual/tutorial.html#producing-values

// typing "hello world"
var input = Rx.Observable.fromEvent(document.querySelector('input'), 'input');
// Only pass unique values through
input.pluck('target', 'value').distinct()
  .subscribe(value => console.log(value)); // "helo wrd"

When I type "hello world", it prints "hello world", is there anything wrong?

RxJS version:
5.0.3
Code to reproduce:
copy the demo codes to make a online demo
http://reactivex.io/rxjs/manual/tutorial.html#producing-values
http://jsbin.com/kiwumisoja/edit?html,js,console,output
Expected behavior:
http://reactivex.io/rxjs/manual/tutorial.html#producing-values
print "helo wrd" in console tab
Actual behavior:
print "hello world"
Additional information:

[martinsik]

@liuyunwei I think it works as expected. When you write for example "Hello" then clear the input and start writing the same "Hello" again it'll be ignored as expected. But if you wrote "Hello2" you'll see a new log in the console "Hello2" because you haven't written this term yet.

[SangKa]

The operators are fine, but the tutorials would confuse some guy.
The following sample code is better for illuminate distinct or distinctUntilChanged:

Rx.Observable
  .of('h', 'e', 'l', 'l', 'o', ' ', 'w', 'o', 'r', 'l', 'd')
  .distinct()
  .subscribe(x => console.log(x));  // h, e, l, o,  , w, r, d

[dengwanc]

as far as i'm concerned,

1. the doc is totally confuse new one
2. in this case simplely

 input.pluck('target', 'value')
  .map(value => distinct(value)) // distinct need implement
  .subscribe(value => console.log(value)); // "helo wrd"

RxJS is not doing every thing, focus on the import part lodash for async

[benlesh]

This is outdated it seems.